Test harnesses

pkgs/development/ruby-modules/bundler-env/default.nix

@@ -24,15 +24,13 @@
 }@args:
 
 let
+  inherit (import ./functions.nix (defs // args)) genStubsScript;
+
   drvName =
     if name != null then name
-    else if pname != null then "${toString pname}-${mainGem.version}"
+    else if pname != null then "${toString pname}-${basicEnv.gems."${pname}".version}"
     else throw "bundlerEnv: either pname or name must be set";
 
-  mainGem =
-    if pname == null then null
-    else gems."${pname}" or (throw "bundlerEnv: gem ${pname} not found");
-
   gemfile' =
     if gemfile == null then gemdir + "/Gemfile"
     else gemfile;
@@ -45,12 +43,13 @@ let
     if gemset == null then gemdir + "/gemset.nix"
     else gemset;
 
-  envPaths = lib.attrValues gems ++ lib.optional (!hasBundler) bundler;
-
-  binPaths = if mainGem != null then [ mainGem ] else envPaths;
-
-  basicEnv = import ./basic args // { inherit drvName pname gemfile lockfile gemset; };
+  basicEnv = (callPackage ./basic.nix {}) (args // { inherit pname gemdir;
+    gemfile = gemfile';
+    lockfile  = lockfile';
+    gemset = gemset';
+  });
 
+  inherit (basicEnv) envPaths;
   # Idea here is a mkDerivation that gen-bin-stubs new stubs "as specified" -
   # either specific executables or the bin/ for certain gem(s), but
   # incorporates the basicEnv as a requirement so that its $out is in our path.
@@ -63,8 +62,26 @@ let
 
   # The basicEnv should be put into passthru so that e.g. nix-shell can use it.
 in
-  (linkFarm drvName entries) // {
-    passthru = {
-      inherit basicEnv;
-    };
-  }
+  if builtins.trace "pname: ${toString pname}" pname == null then
+    basicEnv // { inherit name; }
+  else
+    (buildEnv {
+      inherit ignoreCollisions;
+
+      name = builtins.trace "name: ${toString drvName}" drvName;
+
+      paths = envPaths;
+      pathsToLink = [ "/lib" ];
+
+      postBuild = genStubsScript defs // args // {
+        inherit bundler;
+        confFiles = basicEnv.confFiles;
+        binPaths = [ basicEnv.mainGem ];
+      } + lib.optionalString (postBuild != null) postBuild;
+
+      meta = { platforms = ruby.meta.platforms; } // meta;
+      passthru = basicEnv.passthru // {
+        inherit basicEnv;
+        inherit (basicEnv) env;
+      };
+    })